Then you will need to create a link somewhere in your document. Like so:

<a href="javascript: openpopup('http://www.google.com')"> Click here to open the page in a new window. </a>

And vola! You are now able to open links in a new browser window! Now, this solution will also work for local html documents, but I believe it is always better practice to put the full URLs in anyways. Hope this solution works for you and enjoy!